Dollaseite-(Ce) Mineral Data

Dollaseite-(Ce) Mineral Data +

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General Dollaseite-(Ce) Information

Chemical Formula:

CaCeMg2AlSi3O11(OH,F)2

Composition:

Molecular Weight = 551.04 gm

Calcium 7.27 % Ca 10.18 % CaO

Cerium 25.43 % Ce 29.78 % Ce₂O₃

Magnesium 8.82 % Mg 14.63 % MgO

Aluminum 4.90 % Al 9.25 % Al₂O₃

Silicon 15.29 % Si 32.71 % SiO₂

Hydrogen 0.27 % H 2.45 % H₂O

Oxygen 36.29 % O

Fluorine 1.72 % F 1.72 % F

- % F -0.73 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaCeMg₂AlSi₃O₁₁(OH)_1.5F_0.5

IMA Status:

Approved IMA 1988

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 202605

PDF 41-1469

Dollaseite-(Ce) Image

Images:

Dollaseite-(Ce)

Comments: Glassy brown crystalline grains of dollaseite-(Ce) in matrix.
Location: Ostanmossagruvan, Norberg, Sweden. Scale: Grain size 1 mm.
© Tom Loomis / Dakota Matrix

Dollaseite-(Ce) Crystallography

Axial Ratios:

a:b:c =1.5616:1:1.7787

Cell Dimensions:

a = 8.934, b = 5.721, c = 10.176, Z = 2; beta = 114.31° V = 473.99 Den(Calc)= 3.86

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.915(1), 2.709(0.7), 2.852(0.3),

Crystal Structure:

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Peacor D R , Dunn P J , American Mineralogist , 73 (1988) p.838-842, Dollaseite-(Ce) (Magnesium orthite redefined): Structure refinement and, implications for F + M2+ substitutions in epidote-group minerals, Note: Mg3-x coordinate has been corrected

Physical Properties of Dollaseite-(Ce)

Cleavage:

[???] Indistinct

Color:

Brown.

Diaphaniety:

Translucent

Hardness:

6.5-7 - Pyrite-Quartz

Luster:

Vitreous (Glassy)

Streak:

light brown

Optical Properties of Dollaseite-(Ce)

Gladstone-Dale:

CI calc= 0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.187,KC= 0.1899

Optical Data:

Biaxial (?), a=1.715, b=1.718, g=1.733, bire=0.0180

Calculated Properties of Dollaseite-(Ce)

Electron Density:

r_electron=3.68 gm/cc
note: r_{Dollaseite-(Ce)}=3.86 gm/cc.

Fermion Index

Fermion Index = 0.01623
Boson Index = 0.98377

Photoelectric:

PE_{Dollaseite-(Ce)}= 124.89 barns/electron
U=PE_{Dollaseite-(Ce)} x r_electron= 460.17 barns/cc.

Radioactivity:

GRapi = 25,889.58 (Gamma Ray American Petroleum Institute Units)

Dollaseite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Dollaseite-(Ce)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.91 cm	569,568	1.54E-05	25,889.58	8.51
100 gm / 3.67 cm	56,957	1.54E-06	2,588.96	0.85
10 gm / 1.70 cm	5,696	1.54E-07	258.90	0.09
1 gm / 7.91 mm	570	1.54E-08	25.89	0.01
0.1 gm / 3.67 mm	57	1.54E-09	2.59	0.00
0.01 gm / 1.70 mm	6	1.54E-10	0.26	0.00
0.001 gm / 0.79 mm	1	1.54E-11	0.03	0.00

Weight of pure Dollaseite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.86 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 1.27 % Th) From Sum REE Elements (25.43 % REE)

Dollaseite-(Ce) Classification

Dana Class:

58.2.1a.6 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.2)with cations in [6] and higher coordination; single and double groups (n=1,2)

(58.2.1a)Epidote group (Epidote subgroup)

58.2.1a.1 Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

58.2.1a.2 Allanite-(La)! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.3 Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

58.2.1a.4 Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.5 Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 2₁/m 2/m

58.2.1a.6 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 2₁/m 2/m

58.2.1a.7 Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.8 Hancockite (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.9 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 2₁/m 2/m

58.2.1a.10 Mukhinite Ca2Al2V(SiO4)3(OH) P 2₁/m 2/m

58.2.1a.11 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.12 Strontiopiemontite (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.13 Androsite-(La)! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.14 Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 2₁/m 2/m

58.2.1a.15 Tweddillite! CaSr(Mn,Fe)2Al[Si3O12](OH) P 2₁/m 2/m

58.2.1a.16 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 2₁/a 2/m

58.2.1a.17 Niigataite! CaSrAl3(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.2.1a.18 Vastmanlandite-(Ce)! Ce3CaMg2Al2Si5O19(OH)2F P 2₁/m 2/m

58.2.1a.19 IMA2002-049! (Mn,Ca)(Ce,REE)AlMnMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.2.1a.20 Dissakisite-(La)! (Ca,Fe,Th)(REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F)withLa>Ce P 2₁/m 2/m

58.2.1a.22 IMA2004-015! (Mn,Ca)(REE)VAlMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

Strunz Class:

VIII/C.23-55 VIII - Silicates

VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups

VIII/C.23 - Epidote group

VIII/C.23-10 Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-20 Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-30 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-40 Strontiopiemontite (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-43 Niigataite! CaSrAl3(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

VIII/C.23-45 Tweddillite! CaSr(Mn,Fe)2Al[Si3O12](OH) P 2₁/m 2/m

VIII/C.23-50 Mukhinite Ca2Al2V(SiO4)3(OH) P 2₁/m 2/m

VIII/C.23-52 Androsite-(La)! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-55 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 2₁/m 2/m

VIII/C.23-58 Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 2₁/m 2/m

VIII/C.23-60 Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

VIII/C.23-65 Allanite-(La)! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-80 Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

VIII/C.23-85a Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 2₁/m 2/m

VIII/C.23-85 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 2₁/m 2/m

VIII/C.23-87 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 2₁/a 2/m

VIII/C.23-90 Hancockite (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-100 Zoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) Pnmc 2/m 2/m 2/m

Other Dollaseite-(Ce) Information

References:

PHYS. PROP.(Am.Min.,Vol.73,p838-842,1988) OPTIC PROP.(Am.Min.,Vol.73,p838-842,1988)

See Also:

Links to other databases for Dollaseite-(Ce) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST

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Print or Cut-and-Paste your Dollaseite-(Ce) Specimen Label here :

Dollaseite-(Ce)

CaCeMg2AlSi3O11(OH,F)2
Dana No: 58.2.1a.6 Strunz No: VIII/C.23-55
Locality:

Notes: